Multiple-drilling machine.



R. H. GRANT.

MULTIPLE DRILLING MACHINE.

APPLICATION FILED sBPT.z1,1912.

22,910. Patented Dee. 29, 1914.

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R. H. GRANT.

MULTIPLE DRILLING MACHINE.

APPLIGATION FILED s'EPT.z1.1912.

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APPLICATON FILED SEPT.21. 1/912.

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R. H. GRANT. MULTIPLE DMLLING MACHNE.

4 APPLATION FILED 51213121.1912, 1,122,910. Patented Dec.29,1914. 4 SHIH'fS-SHEET4l zzz/animi' PATENT OFFICE.

ROBERT H. GRANT, OF DETROIT, MICHIGAN, ASSIGNOR TO GRANT AUTOMATIC MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

MULTIPLE-DRILLING MACHINE.

Sipeccaton of Letters Patent.

Patented Dec. 29, 1914.

Application led September 21, 1912. 'Seria1No. 721,665.

T0 all whom t may concern.'

Be it known that I, ROBERT H. GRANT, a resident of Detroit, county of Wayne, and State of Michigan, have invented a new and useful Improvement in Multiple"- Drilling Machines, of which the following 1s a specification, the principle of the invention b eing herein explained and the best Inode in which I have contemplated applying that 'rinciple7 so as to distinguish it from other mventions.

invention 'relates to multiple drilling machines, its objectbeing to provide a maehine'of said character which will be economical in its construction and efficient in its operation.

The said invention consists of. means hereinafter fully described and particularly set forth in the claims. 4

The annexed drawings and the following description set forth in detail certain means embodying my invention, the disclosed i means, however, constituting but one of various mechanical forms in which the principle of my invention may be applied.

In said annexed drawings z-Figure 1 represents a plan of a machine embodying my invention and particularly adapted to drill holes in cylinders and transversely of their axes. Fig. 2 represents a vertical transverse section taken upon the plane indicated by line II-II in Fig. 1. Fig. 3 represents an end elevation of said machine. Fig. 4 represents a fragmentary longitudinal section taken upon the plane indicated by line IV-IV in Fig. 2. Fig. 5 represents a transverse section taken upon the plane indicated by line V-V in Fig. Il. Fig. 6 represents, upon an enlarged scale, a detail plan of one of the clamping devices or vises, and Fig. 7 an end view of same. Fig. 8 represents, upon said enlarged scale, a transverse fragmentary section of the machine taken upon the plane indicated by line VIII- VIII in Fig. 1. .i

The machine illustrated .as embodying the principles of my invention comprises a main-frame 1 which supports the various other'parts thereof.

Mounted upon the frame is a main lon gitudinally placed driving shaft 2, upon which are secured five helical pinions 3. Each of the latter meshes with a helical gear 4 rotatively fixed to a drill-carrying spindle 5. Each such gear is formed with slot 8, through which passes a pin 9 trans- 'f versely fixed to the gear 4f, so that while the spindles are rotatively fixed they are longitudinally recipr'ocable in the gears 4, as will be readily understood.

The rear end of each spindle is rotatively mounted but longitudinally fixed in a slide 10, mounted upon a horizontal and transversely extending guideway 11. Each slide is formed with a downwardly extending portion 12 on the lower extremity of which is mounted an anti-friction roller 13.

Extending longitudinally of the frame and mounted on the rear thereof is a secondary shaft 14 upon which are fixed five cams 15, Vone being placed opposite each roller 13. These cams are all similar in form and size and are set so as to engage the rollers and operate the slides 10 in succession, at the ends lof equal intervals of time and hence so as to cause the spindle to reach the ends of their forward strokes at succeeding and like periods of time. The return strokes of the slides are effected by means of coil-springs 16, Fig. 2. These springs are mounted in bores 17, formed in the slides, into which extend rods 18 abutting the adjacent parts of the frame l, as shown in said Fig. 2.

The secondary or cam-shaft 14: is driven by a set of planetary gears 19, Figs. 4 and 5, whereby the required reduction in speed is obtained and these gears are driven by a countershaft 20 to which is fixed a stepped pulley 21. The latter is driven by a belt 22' passing around a second stepped pulley 23 fixed to one end of the main shaft 2, upon whose other end is fixed the driving pulley 24. y

Mounted upon the front of the frame Fig. 6, and in alinement with the spindles 5 respectively, are lfive clamping devices 25. Each of the latter comprises two oscillatory clamping jaws 26, 26, mounted upon vertical journal pins 27, Q7, fixed to a frame 28. The inner faces of the rear arms of these jaws are formed with the recesses 29, 29, for receiving the cylindrical blank to be drilled, and the outer faces of the front arms thereof, are formed with the cam surfaces 30, 30. The lower ends of the arms of a i bifurcated lever 31,*are pivoted to an eX Vtension 32 of the frame 28, and carry two set screws 33, 33, projecting from the interior of said arms and having their inner ends rounded, as shown in Fig. 6. Between the front arms of the jaws 26, is mounted v a coil-spring 34:V which tends to separate said the latter is mounted upon an upwardly extending portion 35 cfa frame 28 and in a horizontal bore 36 formed therein. These sleevesr are held in place by set screws 37, and are provided with the horizontal bores 38 of a diameter such as will permit thel drills to pass freely but snugly therethrough. The rear ends of saidbores 38 are conically 4.enlarged so as to permit the drill to freely enter. Y

Vertically beloweach blank recess of thek.

jaws is an adjusting screw 39 which forms a rest for the blank when it is being placed in position for clamping.

The ends of the spindles 5 are provided with suitable chucks 40 for holding the` drills.

The above-described device operates as follows:

Assuming that the driving pulley 24 is being driven, the spindles will be reciprocated as previously described, and the drills will be correspondingly caused to intersect the blank seat of the clamping devices. At a time when a drill is retracted from apgiven clamping device, say the right-hand one, the corresponding lever 3l is operated to open the jaws and a blank is placed by hand in the blank seat, resting upon the adjusting screw 39. The said lever is then caused to 4 release the jaws and the latter then clamp the blank.` The drilling operation then follows. In the meantime, the next drill to the left will have r'eceded, and a similar blanke setting and clamping operationl is -per-l formed. In this manner all of the clamping i devices are supplied with b1anks,'from right to left in succession. rlhe mechanism is so timed that by the time the last blank has been set, the drilling operation on the first liasbeen completed, and the operator releases and removes same and supplies another blank in its'place. In this manner,` it

willl be apparent, the device is kept in continuous operation and blanks may be drilled as fast as an operator can remoye the completed work and supply blanks 1n its place.

Having fully described my invention, what I claim and desire to secure by Letters P ati l In a drilling machine, thecombinationof i i 5, a horizontally reciprocating drill-spindle nclamping device in alinement therewith and provided with a blank-receiving seat; and :"1 vertically movable.l screw located beneath said seat and adapted to form a rest for a y blank.

Signed by me this 9th dayv of September ROBERT H. GRANT.

Attestedby RUBY ANDERSON, H. W. HOLMES. 

